/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package geektimes.event.observer;



import geektimes.event.EventListener;

import java.util.EventObject;
import java.util.Observable;
import java.util.Observer;

/**
 * {@link EventListener} Adapter
 *
 * @author <a href="mailto:mercyblitz@gmail.com">Mercy</a>
 * @since 1.0.0
 */
class ListenerObserverAdapter implements Observer {

    private final EventListener listener;

    public ListenerObserverAdapter(EventListener listener) {
        this.listener = listener;
    }

    @Override
    public void update(Observable o, Object arg) {
        if (arg instanceof EventObject) { // arg always is EventObject
            listener.onEvent((EventObject) arg);
        }
    }
}
